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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d14a6aab0779cd5c36a4080db178b2ef5a2cd1fa966ac99ecc4c256f6cb0fa' 
  AND token = 'VwWit7/fp0ZZOp4NMO4rMih7X6/IIPDj/ojwDg0JNGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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