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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf80ba95ad34befac78657915f7dbb07557b8e6314afc5aaa1d114c874e8f625' 
  AND token = 'L1y5v5yCuvxgnp7GW0HK3tZ5R0fCPFuSz2vHCbd5QIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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