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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2300cd74554e7b2bbc9f0e9eaf98dfa0bbe11c80b14c084d83e47f81670a88a' 
  AND token = 'QJ2qz9oQvDCwezY0PLBCuu1yxgMGSMQ4HWigL0FUJwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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