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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d01a5ef9e43d733d463f4c1046155994641feb4a1163a0331ff2618378be9de' 
  AND token = 'btdDZmVJXpuOHwKCbL5hVfvhx96tHwHkoad5QSrtC/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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