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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59222b171ab922ceb631ae2f14e2d24ec0d10b10407cc555f393f0c6c947e33' 
  AND token = 'L2qkIkIeroEp4LV4g1+e8Z0OJ2kBO8K6rZUD69Gye3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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