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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55b5d278481ad88924da586cff1c6a4571659d5c26bf0ba3a3b922c824cc75c' 
  AND token = '57DAYAg3CTfuMHBoCO2O4T6IejzW9xPPdYgqsiJp/Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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