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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be880ff07ed3ee6fd1077b396f3a4c9303c0d35ddf9dd21ba0657417963dbb79' 
  AND token = 'HWr2Wem/9qMQY0gechNyNZgLA38VITNjjok26L2f+lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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