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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7895d66d3550c30a858041e52c88deca95a43c12aa999ae4c3170a86bf3d34f' 
  AND token = 'qMFtJLFTHs+5ZAmVTDS9tut8Ply4T08C5TJzItTER4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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