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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d91a3e46ee603a03a613d0c5acc150a8df982d69f0a766d121ad692d5318974' 
  AND token = 'fbYSLSwG420j7gycl2yi4783f/iA+yhzel4mdqvGWNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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