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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184ce7618e1188f0f0d256f614ff72d3821359c9bfea7e0bee3363f9211c55bd' 
  AND token = 'n/mZooP+JbJGy9p9a8PI8scCrFhcd2BuTe/8PU6kx3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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