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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4efebc82657cb9426e69670e29702c4bb6acbd03c9e8dd4454ea80662c0a25' 
  AND token = 'IE4hqepIgoUrldDyvuh51F1S3ZppkZ25DaAoVurK5yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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