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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f095efb0097a5248d7f9512c4fa93159eec74fac72e2e94813713379ab26d9e' 
  AND token = 'tBGKBL32cEUJDpQdSyZ+o08XvQwUcopn4DyYdt9EHrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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