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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ad877f7287e5757d2918cb488c2c99b084a96aafaea78138877b7da3c4ff32' 
  AND token = '2ReihJElgyOgU1rj6Gf5tQ44dnX0Y7WBRJ9Df3LKrFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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