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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75cc94c97f357471dd4c152e39b3f35254ed2f20d00c36d2e3943329d5e4381' 
  AND token = 'iZh6Ou0pnMflOx/PGHCP91x3weg5YkkY1+AiPeKHW+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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