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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975c79f994aaf688b16343eae32817ec7d2df8274fd651cc0c015c8df4d5089d' 
  AND token = 'AHNzkjLPk4o4Y+jdmA7OXlGsSEMziEklXAJtZERY99o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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