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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f303f953a284c7cb00138b50d4a6793212382e71a44a449562e9236e02ef3e' 
  AND token = '1RA06kOUkxix7TEyM79oa1JGssvbvAINfN9SF0TU/LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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