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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48ce8ed60c41f3fdc6125eeff2060558451a19db97322aa2649be5c90082f4a' 
  AND token = 'FEt2RrkndrgezoFGQGsBMgG76RRlK6cgjC6+8Z8euO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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