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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dad5858b6f084d1783fb2e3729f57df842d7896c11636b0e31ae3d00c8ff60b' 
  AND token = '6PYurCotRWUubddrUvxB96krfEMhabG0mQeXW8Aq2aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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