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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476b4d90cda19a4e94b23c7f4be4ff1a1190d4ec75d8082fa4787db980168edc' 
  AND token = 'McTUbzNysQkLuEbByWsjj/Sx/9LYP8lyQ9lH1DYMaZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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