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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6548f00e4989fb2b9341e3666aa92a4b9d92b498aa61d312671572f890ba14' 
  AND token = 'A0iZN6eqLAR5vl0pZb22SzJjhaRJn3mgwEGLr7W6Rp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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