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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fcfcc899e48e08b38c7dd43344e1bc79d8b9c00dbaf41dbad0b4c3192f2921e' 
  AND token = 'sM3831AFNpOFRGMGUDdi/zT9Jbm3+XCI9y+Vf+ju6KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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