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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093c8b1cc099c846f69a8a1c65b7aba097fc2a7795489a55d1fc0a04f0da034e' 
  AND token = 'gpOCQ/N5tc4s51+oJ94w50V6Sm0ixSHiJEt8N4c6/tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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