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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215a93406b3cb8b99b6ad36f7f21470c4d1824813c51cf4b38f952889cd1df88' 
  AND token = 'z/bgKFUFtpoTwdRlCQsIaHIqsbsuywt5z3Cp1e6MQ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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