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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06a4da3d8f1d6b68a0ba9bdbed82baad491436b8f23857def4d964e4c97a930' 
  AND token = '9iuPr3L8d8i1Oi28aW+agbEDuGuG6JcDrgih/opu/Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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