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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20d3518279e9c1aad8ef5231819e5094ed44abd42f47fd2deb781a46354e1f1' 
  AND token = '8v4kldAGaVUWYwHqkTv+ueJv5gSo3kNqTF3xuFTFmfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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