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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31df0e48c06c592768d280488bcf03f4a0b56e8e0150419be0e2294a72dc0a7f' 
  AND token = 'rL+GMADR8vah2XSFdgKP9HElzK7sWMgIMHiG48hIRBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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