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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caadf07c0dab12d735af700bd6ecc9977e6387ee131f2ab385844a08efeb12c6' 
  AND token = 'kKN6fUK0feGcRNrIllJYi4AhCbJmN1nB1LylYKT8yYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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