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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb8ca25c02ee38396bacfd5e5aa7f7fa34f085c543488e391f28986d56b117a' 
  AND token = 'ukWuSAecj2malq373bNSbNGrnU7Km1zfd4Z6B4Z81fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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