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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af74daf3c92f618244c83a808d16640b7b8117c78313f7d5476226eabf1a4f8' 
  AND token = 'vr4x0pq0cHhB2Khh7L1REen0ptErFYC4A580i1CNqt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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