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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf412c8fbb04f5a17b70436c2abab45cba9be940a119bcea5cdf2be98a7d0664' 
  AND token = 'FqB2Ma52s9oJavWQgspVcav5OrxtlP+iwGPcmMGtl7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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