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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef6ff338ed84e7a30792ca6fa9efe48ff16c80ab8dadacd10e2e0e243acb1a5' 
  AND token = 'iHXGpJgaX/3p2tdny8ZZodXu0/EXaiGt2WKbN3LOMrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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