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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfabf15221f0e1cc7e75dbe830ae6bce5fa5b3dc73aa525d7339f435290bc9bf' 
  AND token = '3Pe1UwpM/Xn0gn392JXUY3nT1Ma2xV83UqgFlz6/5qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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