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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ce8dd5fdb0bfd445debd89d39f0bfacba2b2de9f0ef17ab97cf8ac26ed025c' 
  AND token = 'T4Kd6TP3Mrxy/jfYTR8pBsmnKdrgHjEf7pnvMpKTjOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}