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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07d97736b001d1073a63abf30fd1e54b97a7b7549e40d8ddd9876720f083ad2' 
  AND token = '3LyvmfaWczYDAxf5JjS60hc2VAriq4gGARVB82X+YJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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