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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a54f2ac1dfe409a8433055003008f63c950233d9e57c1bed38cf6581c1bd9d4' 
  AND token = 'vNf40JOwXgkSFdDAbd9NitO3/OIyPbZOlORcnyOOS7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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