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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c707efc386c3c0d93ec9e78e92cf545f02792cc3a40c6cf2eadc64cd2cf3af5c' 
  AND token = 'ajIvg7TKi0P7t9PXodP38iZ7P4lCCnn+hluBZlqH93k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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