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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29edbf4e06db179c74a258dd9a9489cd99b069de39addeb899f9c20dd184dae3' 
  AND token = 'I7SQTujIbshd81oou2M3Qcq5n0OrdhHVRwte1tARdPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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