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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7dbe916a9eab9d176dd667a92c44c67f9eb44fb4df0317086711fcf721f7ae' 
  AND token = 'fC8TgnCEVNYmvDVrQVDqjOq4FDS++P9L/ZUxt5TVpA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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