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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411da30a808ec143aac402fbd1d5b3a969049853ec9a950b5fccbd1263d3a7a2' 
  AND token = 'AmNOU4M98vuomzHnCmdCxwkrtWbpp7XbFQhLYqApNQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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