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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f86bc66beba449e5c48797de01642d5f820f32b1aa8c5b93ba05c2a94f2756e' 
  AND token = 'ScQRROKUzlpPK6is28rSGrJGkuI6ltyUnDRVTP8D6So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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