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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a154eb789086ab96f252e91f50457535bc385d63c3faf96237388a46b05d1eb4' 
  AND token = '7idF5gQ6SVweLgmIggXL7LaRwlNyj0gikb2CBbmG8mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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