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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31cf2d6cd976d546a8b56ce3121883a569f42de1a4f2b35501e8c8ad61a9af4' 
  AND token = 'KqAXKOr0ZFwtpv9ZtSe7jx3dDPvP9XkUCqOg+1O/184=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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