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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912c8456848395ef191f0cb344053bad80d6feddc266d2d2a1faf4bbab213592' 
  AND token = 'ip1gddc6WWR3ARYrFeSH+ISyXQNN54A9HlHm6WZc8xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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