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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b82d5419e9cdb1d0dcad1304242957c29ca37806d70ea262dc6e5ccddf3f2f' 
  AND token = 'wcGAU0AKX163uWDJF5lekU8WczNLS4jhrDdW8O5dNSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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