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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f1f660b8877f20d846a605d0132d4c5dbf322e19abbf2a35df2ac18e26e340' 
  AND token = 'wjVfu2d/aNF9agmmda6ASVwcQ8XV3j0u0soQSYWgev4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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