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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91f82761e55d231db02172698cb6af975e9e2be4d8ce7041689b3e5bf352ee4' 
  AND token = 'y8AksNDBvNFKMyBJvFmM1WAyZNZ/cb/Wsd7T6mb0r3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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