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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc51cd3537434ff4a6aec4c29a8ad2d15c95d816b5e53ca9f219ef3e33c7a6d5' 
  AND token = 'n+ZAMhdukg8f24GuMusEI1M87QsqbnzMqBvXSbyShx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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