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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f8c1cfa5d579d5d46240b8ca753c55c716d7e831252cf0489f50dd69f3e46c' 
  AND token = '4NcGdyT0NQPcg5A7dsZO3zLf1fDuRd4uv9HqqWMm2RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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