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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfd6ff698bcc8071f7b3137d3a58637d4f7750afedd12e8d9c62dce1c047891' 
  AND token = '/6vstVaCT2q9Lqd0rrGCextf5bP0shVBw1r4CNggqIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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