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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326c5c56b8c09d31da267d9934a5a02dd6ad359ab44579de72efb6e4f9f570b0' 
  AND token = '7kWT/crUsIhBOcusc2h7OZgchxX39M01jCvQ9vTgCII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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