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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd216f72248123bf7a6c3121f1d7ebcb73b8ebbe61d608ae6f1e459e9a29abbbb' 
  AND token = 'TKyHr6XlLYdoaYXpVBWHC1yP8ddRHJRV2nYsQ92rylw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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