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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbeeff440400e8a2e7ec3e4427bf85aa6d2f9688b8d17ae929cacaa0daf6ea5' 
  AND token = '1Ci1Oz0YGXf8G9Yo5drdEuR97VzogaoZpu2/X6Lq1NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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