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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fa27b1f03927e6cc4e4e68eeb7702c41b1715a56c9b2b9d2266c27a07a5519' 
  AND token = '9cj2QKKqNeOcK6uLFYeJa0WIFLLlJ47zu+rvt3nEzBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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