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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32843eda6603fbc6e7b65cb7cd12ce813e943d1cdd37f74b5694f4d36a336cb' 
  AND token = 'BLNvDybxC4TAAvBiI8+N88AyTl1wYgt4dSyMm3BSdjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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