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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249c057c786e874c163a8a8143d3de84c5b25bb1252ceeb8183d44f871f0661d' 
  AND token = 'c320V+UC7pE6zTAzBqTfhAR7B5NA9e/26vEHPkByjG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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