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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa9112b6590b4051aa66605e586e900415b6930d001437294f6269f29e5a78b' 
  AND token = 'qeWU3R+3nTuXqFVLBSi4wh5qqpEIanoq2FsSuQ6j3hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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