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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7dc55012ff283736a605271abd6467f2ffdb28484b0b37f1532a13892b7ebe' 
  AND token = 'CHyS45X79auyzB5vnYt9jZ2n7sTO8cmDGcIe+DB7CCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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