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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc22a79efbf63a4fa2a916a83f40f535a534f7ca4a4c96a44d6f41fc3c8739e3' 
  AND token = 'UE/N2Q3yn3GFUxoJjq6ruBVOiyxY6myEs+1ES0PJ+OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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