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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '750c3b2e463f492e238301ccebc7c8e57375bc86ed7091a1c9246ddb151344c2' 
  AND token = 'uWuqrwMA0F2sD6SR+bW8KsrRWoXJO8KYT/ZglybQGP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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