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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b13e71d1e181727f16258d9a9d201a65bb73fd619618670d3d0f6b4da009b8' 
  AND token = 'uujs1hgnH2fd2Fso1QdRVFX7P2pdfZQ0Ooxu3MH1Q6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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