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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e608494e995a6ca28f06d04e273a84e75e60335444984b2d4cbe45e86cfa08d3' 
  AND token = '8xjbevvWHgf0KC0MZ1DHRHlzeOPSgr8bDbCwuIvWb18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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