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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287709f085c1813b98f127cebce488d8a5cb9cd83a40ef396980b84c6fd06b46' 
  AND token = '8BZXqmrI9KJAEP1oCUZy17PjbqcqPBsmlqqV6ZNnD+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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