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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf8a77e3b27f3a516b1734fa57c378cbc4f4fb9682de1766fbc2e8c6e75d592' 
  AND token = 'WdtTJmG9Jk3LUpvBH3JC6VkI2Z6aLIOoO43cyCFU2IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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